MT3870 CONVEYOR OVEN SERVICE AND REPAIR MANUAL BLODGETT OVEN COMPANY www.blodgettcorp.com 50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone (802) 658Ć6600 Fax: (802)864Ć0183 PN M7489 Rev B (6/01) 1996 - G.S. Blodgett Corporation All rights reserved. Duplication of the information in this manual is prohibited without the consent of the Blodgett Service Department.
TABLE OF CONTENTS 1. INTRODUCTION Oven Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ventilation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gas Specifications . . . . . . . . . . . . . . . . . . . .
TABLE OF CONTENTS Belt Speed Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Closed Loop System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open Loop System - Single belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Open Loop System - Twin Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Literature Addendum Operation - Cooking Computer without Conveyor Control NOTE: This addendum applies to tandem ovens only. CONTROL DESCRIPTION 1. DIGITAL DISPLAY - Displays the time, temĆ perature and controller related information. 2. OVEN ON/OFF - Controls power to the oven. 3. NUMERIC KEYS - Used to enter numerical data in the programming mode. 4. CLEAR KEY - Used to clear the display if an error is made in the programming mode. 5. SET TEMP KEY - Used to view or program the temperature setpoint. 6.
Literature Addendum Operation - Cooking Computer without Conveyor Control OPERATION OVEN SHUTĆDOWN Turn the Computer Controller off (press and moĆ mentarily hold the ON/OFF key). Since the Cool Down circuit is already energized, the blower motor(s) will continue to run until the oven reaches approximately180 F (82 C). The blowĆ er motor(s) will then automatically shut off. To turn the oven on: 1. Turn the manual gas valve to ON. 2. Press and hold the ON/OFF key (2).
Literature Addendum Operation - Cooking Computer without Conveyor Control PROGRAMMING PROCEDURES Programming the Cook Time: 1. The conveyor belt default time is 0. Programming the Temperature: 1. Press the PROGRAM/ENTER key (8). 2. Press the SET TEMP key (5). The display reads PROGĆ? SET TEMPĆ? _ _ _ _ F. 3. Use the NUMERIC keys (3) to enter the deĆ sired temperature set point. The control disĆ plays the numbers as they are entered. If an error is made, press the CLEAR key (4) and reĆenter the number.
CHAPTER 1 INTRODUCTION
MT3870 OVEN SPECIFICATIONS VENTILATION REQUIREMENTS Installations within the U.S. The MT3870 requires a 15 Amp, 60HZ, 1F, 208Ć240VAC, 4 wire service consisting of L1, L2, neutral and ground. See FIGURE 1. Use 90 C wire and size to National Electric or local codes. The hood should completely cover the unit with an overhang of at least 6" (15 cm) on all sides not adjaĆ cent to a wall. The distance from the floor to the lower edge of the hood should not exceed 7' (2.1 m).
INTRODUCTION GAS SPECIFICATIONS GAS CONNECTIONS GAS REQUIREMENTS Domestic and General Export installations The firing rate for the MT3870 is 150,000 BTU/Hr. (43.9 kW/Hr.) The gas line should be large enough to accommoĆ date the peak demand of all the gas appliances. TABLE 2 reflects a straight line, 50 foot run with no coupling restrictions and no other appliances drawing service. Gas line installations MUST conĆ form to National Fuel Gas Code NFPA 54/ANSI Z223.1 Sec. 1.4 (Latest Edition).
MT3870 ILLUSTRATED PARTS LISTS ELECTRICAL COMPONENTS NOTE: = ASAP Distributor Required Stocking Parts Ref. Part No. No. 1 1 Computer Control Kit, Closed Loop SB (Qty 1) FW525 Computer Control Kit, Closed Loop SB (Qty 1) (Reconditioned) M6474 M5635 M3175 M7427 M7202 M3347 M3348 M3490 M3491 2 3 Ref. Part No. No.
INTRODUCTION CONVEYOR COMPONENTS NOTE: = ASAP Distributor Required Stocking Parts * = Item is Too Large for UPS Ref. Part No. No. 19 20 M6338 Belt, Wire S/S (Total Length 38" SB (Per Foot) MT3870 18 FT, MT3855 16 FT) M7889 Belt, Wire S/S (Total Length 18-1/2" TB (Per Foot) MT3870 18 FT) M7272 Tensioner (After Assy.
MT3870 CONVECTION COMPONENTS NOTE: = ASAP Distributor Required Stocking Parts Ref. Part No. No. Ref. Part No. No. Description Description 33 M4224 Motor & Blower Assy. CW MT3870 (Qty 2) M1962 Hold Down, Nozzle MT3870 (Qty 1) (Before 9/15/95) 34 M4225 Motor & Blower Assy. CCW MT3870 (Qty 2) M7399 Hold Down, Nozzle MT3870 Qty 1) (After 9/15/95) M5419 Motor & Blower Assy.
INTRODUCTION GAS BURNER COMPONENTS NOTE: = ASAP Distributor Required Stocking Parts Ref. Part No. No. 40 22132 Ref. Part No. No. Description Description Burner Assy. Complete (Specify Model & Gas Type) (Qty 1) 63 21278 Nipple, Pipe 1/2 x 3-1/2 (Qty 1) 41 M0767 Blower Motor, Comb.
MT3870 EXTERIOR COMPONENTS NOTE: = Doors are not returnable Ref. Part No. No. M2868 M2188 Ref. Part No. No. Description Door Assembly, Pull Down S/S (used w/enclosed Greenheck hood system) (Qty 1) Handle Kit, Door 2" (used w/M2868) (Qty 1) 79 Description M7575 Extension Assy.
INTRODUCTION Ref. Part No. No. M5485 Panel & Filter Assy. MT3855G (Qty 1) (After 11/14/95) XXXXX Control Box Cover w/ Louvers MT3855G (Qty 1) (Before 11/14/95) M6799 Control Box Cover w/ Access Door MT3855G (Qty 1) (After 11/14/95) XXXXX Ref. Part No. No.
MT3870 EXCLUSIVE TO EXPORT NOTE: = ASAP Distributor Required Stocking Parts Ref. No. Part No. 88 M2276 Burner Assy., Complete (Qty 1) 89 M4597 Motor & Blower Assy., CW MT3870 (Qty 2) 90 M4598 Motor & Blower Assy., CCW MT3870 (Qty 2) 91 M6000 Dual Solenoid/Pressure Regulator, Nat.
INTRODUCTION MT3870 DOMESTIC & GENERAL EXPORT CONTROL BOX (Control Plate and/or Gas Burner Components not Shown) 1-10
MT3870 MT3870 CE CONTROL BOX (Control Plate and/or Gas Burner Components not Shown) 1-11
INTRODUCTION MT3870 DOMESTIC GAS BURNER COMPONENTS (Control Box not Shown) 1-12
MT3870 MT3870 CE GAS BURNER COMPONENTS (Control Box not Shown) 1-13
INTRODUCTION MT3870 DOMESTIC & GENERAL EXPORT SB CONTROL PLATE ASSY (M6590) 1-14
MT3870 MT3870 CE SB CONTROL PLATE ASSY (M6589) 1-15
INTRODUCTION MT3870 EXTERIOR OVEN VIEW 1-16
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CHAPTER 2 ASSEMBLY
MT3870 OVEN ASSEMBLY PROCEDURES RETURN AIR DIVERTERS WIRE CONVEYOR BELT 1. Slide the return air diverters into the oven and clip to the lower rear of the baking cavity. The edge of the diverter should be 3" (7.6 cm) from the outside edge of the oven cavity. NOTE: The conveyor belt has loops on all four sides. The belt must be installed so the loops travel as shown in FIGURE 2. 1. Thread the wire belt from the right side of the oven, lower level first. 2.
ASSEMBLY END PLUGS the front of the oven. If a direction change is reĆ quired, the polarity of the drive motor must be reĆ versed. To change the polarity of the drive motor, disconnect the oven from the power source and inĆ terchange the black and white motor leads at the D.C. Controller Board located within the control box. If the polarity of the motor is changed to rightĆtoĆleft belt travel, the conveyor belt must be installed from the left side of the oven inĆ stead of the right side. 1.
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CHAPTER 3 OPERATION
MT3870 COMPUTER CONTROLLER 1 2 9 3 8 7 6 5 4 FIGURE 1 CONTROL DESCRIPTION CONTROL OPERATION 1. DIGITAL DISPLAY - Displays the time, temĆ perature and controller related information. To turn the oven on: 1. Press and hold the ON/OFF key (2). The disĆ play reads OFF when the oven is idle. 2. The display flashes WAIT LOW SET TIME mmss. 3. The FAN and HEAT status lamps (9) light. The fans begin to run. The heat rises to the proĆ grammed temperature.
OPERATION PROGRAMMING PROCEDURES DISPLAY INFORMATION Programming the Cook Time: WAIT LOW - indicates that the present oven temperature is lower than the set point temperĆ ature. When the oven reaches the set point temperature the display changes to READY. READY - indicates that the oven is ready to acĆ cept product. SET TIME mmss - indicates the current cook time setting. HIGH TIME - indicates that the temperature is well above the set point.
MT3870 SEQUENCE OF OPERATION DOMESTIC AND GENERAL EXPORT OVENS COMPONENT REFERENCE OPERATION NOTE: Refer to FIGURE 3 for component locaĆ tions. 1. Apply power to the oven. Program the time and temperature into the computer (1). The burner valve relay (2), blower relay (3) and main conĆ trol relay (4) energize powering up the oven. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19.
1 1 2 FIGURE 2 3-4 18 19 5 4 3 16 13 17 6 17 17 14 15 8 7 17 12 9 10 11 OPERATION
MT3870 CE OVENS COMPONENT REFERENCE IS NOT PROGRAMMED INTO THE COMPUTER. NOTE: Refer to FIGURE 3 for component locaĆ tions. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 5. The heat relay (8) sends 230 volts to a single pole single throw thermal switch (9). If closed the relay continues to send power to one side of a single pole single throw relay (10). This relay will not see power at it's coil until a triple pole double throw relay (11) closes.
1 6 2 5 16 8 3 15 3 7 17 3 4 9 3 12 10 13 14 11 OPERATION FIGURE 3 3-6
MT3870 OVEN ADJUSTMENTS FOR COOKING TEMPERATURE EXAMPLE: A good bake time and temperature have been esĆ tablished, but more browning on top of the pie is desired. Relocate one of the blockĆoff plates" above the belt to open a few rows of holes toward the exit end of the oven. This will allow more of the superheated air to brown the top just prior to exitĆ ing the oven.
CHAPTER 4 CALIBRATION AND ADJUSTMENT
MT3870 CONVECTION BLOWER MOTORS TO CHECK MOTOR ROTATION TO CHECK LOWĆLIMIT 1. Remove the back of the oven body and verify proper motor rotation. (See FIGURE 1) 1. Turn the oven on and let it heat up to approxiĆ mately 200 F (93 C). For motor placement, the direction of rotation is viewed from the oven's rear and working from left to right, beginning at the control box. In most cases, the motor direction is referenced to the end of the shaft (EOS).
CALIBRATION AND ADJUSTMENT REGULATED GAS PRESSURE 1. Let the oven run up to 510 F (266 C). You may now verify the operational and regulated gas pressures. justing screw located under a screw cap on the left front side of the dual regulated valve. Adjust the gas pressure by turning the screw clockwise to raise the gas pressure and counterĆclockwise to lower the gas pressure.
MT3870 COMPUTER CONTROL CONFIGURATION INITIATING ACCESS MODE CONFIGURATION The Cooking Computer provides a special Access Mode for setting and displaying certain computer special functions. To initiate the Access Mode place the control in the OFF state, (OFF is shown in the display when power is first applied to the control). Press the following sequence of keys to set the control to Access Mode: CLEAR 1 2 3 4 5 6 ENTER. The display will show ACCESS.
CALIBRATION AND ADJUSTMENT DISPLAY OPTĆ1 ACTION TAKEN Press PROG ENTER DISPLAY DONE SAVE EXIT ACTION TAKEN Press PROG ENTER OPTĆ2 may be selected for MT3870 ovens only. If OPTĆ2 is selected values will be sequenced by pressing the PROG/ENTER key. Any value can be changed when its value is displayed, by entering the new nuĆ merical value followed by the PROG/ENTER key. After sequencing through all values the display will return to ACCESS.
MT3870 TEMPERATURE CALIBRATION TO ENTER THE CALIBRATION MODE 1. Press PROG/ENTER followed by ACT_TEMP. The display flashes either POS * OFFSET or NEG * OFFSET 1. Press the ON/OFF key until OFF is displayed. 2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the access mode. The display reads ACCESS. NOTE: POS OFFSET is displayed if a value has been programmed in for a positive offĆ set. NEG OFFSET is displayed if a valĆ ue has been programmed for a negaĆ tive offset.
CALIBRATION AND ADJUSTMENT BELT SPEED CALIBRATION CLOSED LOOP SYSTEM To enter the calibration mode: 3. ENTER ACTUAL TIME - Place an object on the belt. Note the time from entrance to exit. Enter the actual measured time. 1. Press the ON/OFF key until OFF is displayed. 2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the Access mode. The display reads ACCESS. 4. ENTER TEST TIME - If the actual measured time is not within 5 seconds of the test time, reĆ peat the belt verification test to obtain better accuracy.
MT3870 OPEN LOOP SYSTEM - SINGLE BELT To enter the calibration mode: The belt will travel very slowly during this part of the calibration procedure. To minimize the time spent on STEP-2, measure off 10" on the conveyor support. Place an object on the belt and note the travel time for the 10" measured distance. 1. Press the ON/OFF key until OFF is displayed. 2. Press CLEAR 1 2 3 4 5 6 ENTER to enter the Access mode. The display reads ACCESS. 3.
CALIBRATION AND ADJUSTMENT OPEN LOOP SYSTEM - TWIN BELT To enter the calibration mode: The belt will travel very slowly during this part of the calibration procedure. To minimize the time spent on STEP-2, measure off 10" on the conveyor support. Place an object on the belt and note the travel time for the 10" measured distance. 1. Press the ON/OFF key until OFF is displayed. 2. Press CLEAR FRONT BELT, FRONT BELT, FRONT BELT, PROG/ENTER to enter the AcĆ cess mode. The display flashes ACCESS. 3.
MT3870 MOTOR CONTROL BOARD ADJUSTMENT High/low speed motor control board adjustĆ ment for 180 and 130 volt DC motors COMPUTERIZED OVENS 130 Volt System NOTE: The motor control board is located on the slide out control panel. High Speed Motor Adjustment: For closed loop systems follow Belt Speed VerificaĆ tion through STEP 5 (see page 4-6). For open loop systems follow Belt Speed Calibration through STEP 2 (see page 4-7 or 4-8). 1.
CALIBRATION AND ADJUSTMENT Minimum Speed Torque (current) limiting adjustment (DO NOT ADJUST) Maximum Speed Acceleration Adjustment Switches 2,4,5,6,7 ACC Yellow or Violet (pin 12) Orange or Gray (pin 10) Line Fuse ON DIP Switch on early models only TP2 Socket J1 Blue Gray TORQ MIN TP1 Test Points Blue (pin 8) Violet MAX REG Regulation Adjustment Armature Fuse FL TB1 Speed Pot L N A1 NOTE: Colors may vary between early ovens.
MT3870 RERATING THE APPLIANCE Due to the lack of oxygen at higher elevations, the unit may need to be rerated. (The orifice size may need to be adjusted to accommodate different air pressures at higher elevations.) If not rerated, inĆ complete combustion may occur releasing AldeĆ hydes and CO or Carbon Monoxide. Any of these are unacceptable and may be hazardous to the health of the operator. To choose the correct orifice for different altitudes several factors must be known: 1.
CALIBRATION AND ADJUSTMENT CHECKING THE FIRING RATE Method #1 Locate the time observed in STEP 2. Move across the table to either the 1/2 cu. ft. or the 2 cu. ft. column to find the gas input to the burner. 1. Turn off all other appliances on the line. Press the ON/OFF key on the unit to call for heat. 2. Using either the 1/2 cu. ft. or the 2 cu. ft. dials, note the time it takes the indicator to complete one revolution. See FIGURE 5. 3.
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CHAPTER 5 TROUBLESHOOTING
MT3870 DC DRIVE SYSTEM POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #1 - Conveyor Belt will not run Oven in OFF mode. Turn to ON position. Loose computer controller cord connection. Adjust and retighten cables and set screws. Time not programmed into computer. Program in a cook time. See Operation Section (page 3-2). Emergency stop switch on OFF. Pull switch out to ON. Control circuit breaker tripped. Reset breaker. Belt hooked on something in oven.
TROUBLESHOOTING COMPUTER CONTROL SYSTEM POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #1 - Computer controller displays: PROBE Ć OPEN Ć PROBE Ć SHORT and alarm buzzer sounds Internal problem with computer controller. Verify display integ. in the 2nd level programĆ ming. If the controller has been programmed the computer may need to be replaced. Loose connections at computer controller. Tighten connections. Shorted or open RTD probe.
MT3870 HEATING SYSTEM POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #1 - Burner will not fire Oven in OFF mode. Turn to ON position. Emergency stop switch on OFF. Pull switch out to ON. Control circuit breaker tripped. Reset breaker. Combustion motor not running. Check transformer for primary and secondary voltage. Check main control and burner valve relays to see if closed. Check relay in combustion burner box. If bad reĆ place relay.
TROUBLESHOOTING POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #2 - Oven will not reach desired temperature Gas pressure to oven is too low. Contact local gas representatives. Top air plates missing. Install air plates. Faulty RTD probe. Use the chart in the Technical Appendix (page 6-10) to determine if probe is bad. Replace if necessary. Blower motor(s) running backward. Verify voltage to motor. If voltage is present, reĆ place the motor or start capacitor.
MT3870 CONVECTION SYSTEM POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #1 - Blower motor(s) not running Oven in OFF mode. Press ON/OFF key. Emergency stop switch on OFF. Pull switch out to ON. No power to oven. Verify power to motor(s). If there is voltage presĆ ent, replace the motor. If voltage is not present, check the motor contactor. Motor circuit breaker tripped. Reset circuit breaker. Determine amp draw. Faulty start capacitor. Replace capacitor.
TROUBLESHOOTING POSSIBLE CAUSE(S) SUGGESTED REMEDY Symptom #3 - Hood system does not operate when oven is on Fan exhaust/supply problem. Contact HVAC service. Defective interlock circuit. Replace auxiliary contactor. Symptom #4 - Blower motor running backward Motor off by thermal overload (other fans forcing blower to spin). Determine if the cooling blower (or fans) are operĆ ating. If not, verify voltage to the cooling blower.
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CHAPTER 6 TECHNICAL APPENDIX
MT3870 INTERMITTENT IGNITION SYSTEM PRINCIPLES OF OPERATION In the IID system the probes exposed to the pilot flame are the Flame Sensor and the Pilot Burner Hood. Since the surface area of the pilot hood is larger than the flame sensor, the current rectificaĆ tion process takes place. Current is conducted from terminal 4 at the control through the flame sensor cable to the flame sensor.
TECHNICAL APPENDIX SERVICE PROCEDURES To Measure DC Flame Sensing Current: Service the IID system as follows: 1. Turn off the power supply to the ignition conĆ trol. 1. Make certain the thermostat contacts are open. 2. Disconnect the flame sensor cable from termiĆ nal #4 on Johnson units or terminal #1 on LanĆ dis & Gyr units. 2. Check for proper supply voltage at primary and secondary of system transformer. 3. Set the selector switch on the meter to microĆ amp scale.
MT3870 5. Install the Y75 sensing probe into the pilot burner. Reconnect the sensing probe cable. The connections to the sensing probe and control terminal must be secure. REPAIRING THE ELECTRONIC IGNITION SYSTEM Flame Sensing Current Maintenance: The flame sensor is made of carbon steel and subĆ ject to contamination and oxidation buildup. Any buildup on the sensor can add enough resistance to drop the signal below the required minimum. Carbon and oxidation can also build up on the pilot hood.
TECHNICAL APPENDIX SERVICING THE INVENT HOOD ILLUSTRATED PARTS LIST QTY PART DESCRIPTION (SEE FIGURE 3) ITEM 1 AMU/Exhaust Manifold/Duct Connection 1 1 AMU Duct Extension, 10 x 18 x 9"h 2 1 Exhaust Duct Extension, 9 x 18 x 12"h 3 1 AMU Support Bracket, Right 4 1 AMU Support Bracket, Left 5 1 Lower Front AMU Panel 6 1 Middle Front AMU Panel 7 1 Upper Front AMU Panel 8 2 Filter Trough/Receptacle 9 2 Filter,10x16" 10 2 Filter, 10 x 20" 11 1 Vertical Exhaust Manifold, Right
MT3870 14 2 15 3 20 1 16 9 8 17 12 7 19 4 10 18 6 13 11 5 FIGURE 3 CLEANING AND MAINTENANCE (plastic or metal) on the exterior surfaces as they will scratch and mar the exterior finish. Rinse the panels in warm water and dry them. 5. Reinstall the Filter Trough/Receptacles, Filters and End Enclosures. CAUTION! The oven and the ventilation system get hot during operation. Allow the oven/ ventilation system assembly to cool so as to avoid possible injury. EVERY THREE MONTHS 1.
TECHNICAL APPENDIX SERVICING ACCESS (plastic or metal) on the exterior surfaces as they will scratch and mar the exterior finish. Wipe out the exhaust channel portion of the AMU/Exhaust Manifold/Duct Connection (item 1) assembly. Brush and clean the guards of the oven cooling fans. For servicing the oven, disconnect the gas and electric services from the oven. Use the following procedure to move the oven/ventilation system asĆ sembly for maintenance. 1.
MT3870 PRESSURE CONVERSION PRESSURE CONVERSION CHART in/H2O P.S.I in/Hg mm/H2O mm/Hg kg/cm2 bar mbar Pa kPa 1 .0361 .0735 25.41 1.868 .0025 .0025 2.489 248.9 .2489 2 .0722 .1470 50.81 3.736 .0051 .0050 4.978 497.8 .4978 3 .1083 .2205 76.22 5.604 .0076 .0075 7.467 746.7 .7467 4 .1444 .2940 101.62 7.472 .0102 .0099 9.956 995.6 .9956 5 .1804 .3673 127.0 9.335 .0127 .0124 12.44 1244 1.244 6 .2165 .4408 152.4 11.203 .0152 .0149 14.93 1493 1.
TECHNICAL APPENDIX in/H2O P.S.I in/Hg mm/H2O mm/Hg 28 1.010 2.056 710.8 52.26 29 1.047 2.132 736.8 30 1.083 2.205 31 1.119 32 kg/cm2 bar mbar Pa kPa .0710 .0696 69.64 6964 6.964 54.18 .0736 .0722 72.19 7219 7.219 762.2 56.04 .0761 .0747 74.67 7467 7.467 2.278 787.5 57.91 .0787 .0772 77.15 7715 7.715 1.155 2.352 812.8 59.77 .0812 .0796 79.63 7963 7.963 33 1.191 2.425 838.2 61.63 .0837 .0821 82.12 8212 8.212 34 1.227 2.498 863.5 63.
MT3870 CONVERSION FACTORS COMMON CONVERSION FACTORS PRESSURE CONVERSIONS FACTORS Multiply By To Get Multiply By To Get BTU/hr .001054804 MJ/hr in/H2O 0.0361 P.S.I. .0002931 kW 25.41 mm/H2O .29285 W 1.868 mm/Hg .0372589 MJ/m3 .0025 kg/cm 2 8.905102 kcal/m 3 .0025 bar MJ/hr 948.0434279 BTU/hr 2.489 mbar Mj/m 3 26,839225 BTU/ft 3 248.9 Pa kW 3414.71732 BTU/hr .2489 kPa ft3 .02832 m3 27.71 in. H2O ft2 .09290304 m2 2.036 in. Hg inches 25.40005 mm 703.
TECHNICAL APPENDIX COOKING COMPUTER - TEMPERATURE VS RESISTANCE T/F Res/Ohms T/F Res/Ohms T/F Res/Ohms T/F Res/Ohms 70 541.12 230 711.43 390 877.15 550 1038.293 75 546.51 235 716.68 395 882.26 555 1043.255 80 551.9 240 721.92 400 887.36 560 1048.212 85 557.28 245 727.16 405 892.46 565 1053.165 90 562.66 250 732.4 410 897.55 570 1058.113 95 568.04 255 737.63 415 902.63 575 1063.057 100 573.4 260 742.85 420 907.72 580 1067.997 105 578.
